The foreign textile research institute divides the proportion of different mature fibers in the raw materials into three groups: M1R=0.85, M2R=0.75, and M3R=0.65. Spinning tests are carried out. The results of the tests are shown in Table 1.
The above table shows that the greater the proportion of immature fibers in the raw cotton, the greater the increase in nep content in the spun yarn.
With these three sets of raw cotton spun yarn weaving, although no problem was found on the grey cloth , after dyeing, it was found that the white point of the raw cotton having a large content of immature fibers was significantly higher than the white point of a raw fabric woven with a large content of mature fibers.
2. The fineness and maturity of raw cotton are generally expressed by micronaire values. The better the maturity of raw cotton, the higher the micronaire value and the different varieties of raw cotton. The micronaire value is also different.
The high-tight fine cashmere raw cotton has good elasticity and high strength. In the spinning process, the neps produce less, and the fibers with low maturity are poor in rigidity due to thick fibers, and the single strength is low. Under the same impact conditions, Neps and staple fibers are easily produced.
If the opener beater speed is 820 rpm, due to the different micronaire values ​​of the cotton fiber, the resulting neps and short fibers are also different, but correspondingly reduce the beater speed, the situation will be improved, see Table 2
The above table shows that: fiber fineness and maturity are different, and different from the micronaire value, the effect on the content of yarn neps is not the same.
3. When choosing raw cotton and designing open-cutting and carding techniques, it is necessary to consider the length, miscellaneous, short-fleeed and other indicators. In particular, attention should be paid to the choice of the original cotton micronaire value, especially in the production and processing of fine cotton. In the case of cotton and long-staple cotton, the size of micronaire is even more important. Micronaire values ​​are generally selected from 3.8 to 4.2. During the design of mixed cotton and spinning technology, we must also pay attention to the condition of cotton fiber maturity to ensure that the production of neat neps is reduced, and the quality of spinning, weaving and dyeing are improved steadily.
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